You have Netflix in your source list, so if you want to change to Netflix use the documented service.
https://www.home-assistant.io/integrations/media_player/#service-media_playerselect_source
Your Samsung tv menu might be little different. This is how I have on mine.
I used fast google search to find my settings. You need to understand we trying to help you with minimal information about your tv.
Maybe try:
Go to Control Panel > System > Power > Wake-on-LAN (WOL)
How much I understand. You using default “Samsung Smart TV” integration.
All steps I told you. Have been used on my tv using that integration and reading documentation for it.
Here in not even sure what you mean. Do you use your tablet google home app and google assistant. What is not connected to HA?
sorry about my english, what I meant was
That I have bougth a mi pad 6, and after getting it to work after the first steps, My samsung TV just appeared on the pad and I was abble to switch the TV on from the pad, something I can´t achieve from HA or any other device, nor using HA neither using google home, only from mi pad works the switch on command. It is very weird.
don´t know if I explain myself
How your tv communicates with Google home app . That’s something between your tv and tablet google home app. That’s nothing to do with HA.
When I first configured official “Samsung Smart Tv” integration. I could not turn tv on also. Only off.
By following documentation steps. Activating WakeOnLan on tv and adding small code in configuration file. What I mentioned in my other reply’s. I got it working. Turn tv on.
In not sure what you do wrong.
Did you follow all our steps?
Try to be more specific what steps you try.
So we know what is working and what is not.
We here trying to help you with tv integration with HA.
Not with google home app on your tablet.
Hope in not being rude 
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where do i find the mac? I guess
mac: aa:bb:cc:dd:ee:ff
it is not what I have to write to my yaml file
I did not change that part. I left it how it was.
In case you need mac address probably you can find in your router.
For me i put that code in config file as i mentioned in my previous replay.
Try the arp command, it will tell you.